12019 (3) - Pigeonite basalt
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Fact sheet
Description: 

12019 is a porphyritic basalt with high proportion of pigeonite phenocrysts and a few vesicles. In places its outer surface is pock marked with micrometeorite craters. It has not been dated. 12019 has a variolitic texture with abundant small pyroxene phenocrysts set in a fine-grained groundmass. It is unusual in that it has many small pyroxene phenocrysts instead of a few large ones. Groundmass includes small (0.6-0.05 mm) laths of plagioclase, pyroxene, ilmenite with minute anhedral ulvöspinel, troilite and metallic iron (containing Ni and Co).

The sample weighed 462.4 grams before analysis.

Deterioration of the mounting resin over time has produced a crystal-rich margin to this sample.

Further details of this and other Apollo samples are here: http://curator.jsc.nasa.gov/lunar/

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Not known
Ma = Millions of years ago
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igneous
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